<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .p1 {
          color: red;
        }
        .p2 {
            font-size:50px;
           color:blue;
        }
      </style>
</head>
<body>
      <div>
        <p class="p1 p2">段落的内容</p>
      </div>
</body>
</html>